{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:JFKRWRN3IB6NMEIXFTE7GQ73QI","short_pith_number":"pith:JFKRWRN3","canonical_record":{"source":{"id":"1901.03175","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2018-12-21T16:26:36Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"ed71590c83c9386acd0f1ac2c30db087458f503966112d680aff4ca550ba8edd","abstract_canon_sha256":"144d91c76c53d8aaafa92c5160d54af145cd8d12f7e064d1f81266ba4e353777"},"schema_version":"1.0"},"canonical_sha256":"49551b45bb407cd611172cc9f343fb821f4d5cc30b8c7503bdbd33eeaf667f0a","source":{"kind":"arxiv","id":"1901.03175","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.03175","created_at":"2026-05-17T23:43:16Z"},{"alias_kind":"arxiv_version","alias_value":"1901.03175v2","created_at":"2026-05-17T23:43:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.03175","created_at":"2026-05-17T23:43:16Z"},{"alias_kind":"pith_short_12","alias_value":"JFKRWRN3IB6N","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_16","alias_value":"JFKRWRN3IB6NMEIX","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_8","alias_value":"JFKRWRN3","created_at":"2026-05-18T12:32:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:JFKRWRN3IB6NMEIXFTE7GQ73QI","target":"record","payload":{"canonical_record":{"source":{"id":"1901.03175","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2018-12-21T16:26:36Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"ed71590c83c9386acd0f1ac2c30db087458f503966112d680aff4ca550ba8edd","abstract_canon_sha256":"144d91c76c53d8aaafa92c5160d54af145cd8d12f7e064d1f81266ba4e353777"},"schema_version":"1.0"},"canonical_sha256":"49551b45bb407cd611172cc9f343fb821f4d5cc30b8c7503bdbd33eeaf667f0a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:43:16.945800Z","signature_b64":"HQKUpkh2m8aBdoAHaV9gFKNbklU+hB/Zgs5aySM1NBGHKVQmjwBToeHr8LTaOLTBudQB2ttgWegXLVJk/+uFDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"49551b45bb407cd611172cc9f343fb821f4d5cc30b8c7503bdbd33eeaf667f0a","last_reissued_at":"2026-05-17T23:43:16.945140Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:43:16.945140Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.03175","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:43:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6+hnDXAvVhsziM3yWQtKN7gNU8afzj4S4dQGCgqk+V/0N31d6eWsaiDpqDtnATVI4Lq2j5ELYhaU+HdNMAWBBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T22:45:11.872230Z"},"content_sha256":"1a3990921963ae1f7f38b10c021db2ca28cc47c73ec31eba914791f48e0848be","schema_version":"1.0","event_id":"sha256:1a3990921963ae1f7f38b10c021db2ca28cc47c73ec31eba914791f48e0848be"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:JFKRWRN3IB6NMEIXFTE7GQ73QI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"SIMPLE code: optical properties with optimal basis functions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"physics.comp-ph","authors_text":"Gianluca Prandini, Mario Galante, Nicola Marzari, Paolo Umari","submitted_at":"2018-12-21T16:26:36Z","abstract_excerpt":"We present SIMPLE, a code developed to calculate optical properties of metallic and insulating extended systems using the optimal basis method originally proposed by E. L. Shirley in 1996. Two different approaches for the evaluation of the complex dielectric function are implemented: (i) the independent-particle approximation considering both interband and intraband contributions for metals and (ii) the Bethe-Salpeter equation for insulators. Since, notably, the optimal basis set is systematically improvable, accurate results can be obtained at a strongly reduced computational cost. Moreover, "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.03175","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:43:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DCiUwdhsYAyWkbtwaJSQQBsXB9kEt4bUGxVZzGlaRvkIHMZ0cG8Nxb7ctMTkZbF1+L+ij4F9cOXBIP21HnBrAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T22:45:11.872717Z"},"content_sha256":"ae63ae7143dfa3acc9bf5c3ac38fac68eede0d07e2657a5575cc1a59daf433fd","schema_version":"1.0","event_id":"sha256:ae63ae7143dfa3acc9bf5c3ac38fac68eede0d07e2657a5575cc1a59daf433fd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JFKRWRN3IB6NMEIXFTE7GQ73QI/bundle.json","state_url":"https://pith.science/pith/JFKRWRN3IB6NMEIXFTE7GQ73QI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JFKRWRN3IB6NMEIXFTE7GQ73QI/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-30T22:45:11Z","links":{"resolver":"https://pith.science/pith/JFKRWRN3IB6NMEIXFTE7GQ73QI","bundle":"https://pith.science/pith/JFKRWRN3IB6NMEIXFTE7GQ73QI/bundle.json","state":"https://pith.science/pith/JFKRWRN3IB6NMEIXFTE7GQ73QI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JFKRWRN3IB6NMEIXFTE7GQ73QI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:JFKRWRN3IB6NMEIXFTE7GQ73QI","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"144d91c76c53d8aaafa92c5160d54af145cd8d12f7e064d1f81266ba4e353777","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2018-12-21T16:26:36Z","title_canon_sha256":"ed71590c83c9386acd0f1ac2c30db087458f503966112d680aff4ca550ba8edd"},"schema_version":"1.0","source":{"id":"1901.03175","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.03175","created_at":"2026-05-17T23:43:16Z"},{"alias_kind":"arxiv_version","alias_value":"1901.03175v2","created_at":"2026-05-17T23:43:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.03175","created_at":"2026-05-17T23:43:16Z"},{"alias_kind":"pith_short_12","alias_value":"JFKRWRN3IB6N","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_16","alias_value":"JFKRWRN3IB6NMEIX","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_8","alias_value":"JFKRWRN3","created_at":"2026-05-18T12:32:31Z"}],"graph_snapshots":[{"event_id":"sha256:ae63ae7143dfa3acc9bf5c3ac38fac68eede0d07e2657a5575cc1a59daf433fd","target":"graph","created_at":"2026-05-17T23:43:16Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We present SIMPLE, a code developed to calculate optical properties of metallic and insulating extended systems using the optimal basis method originally proposed by E. L. Shirley in 1996. Two different approaches for the evaluation of the complex dielectric function are implemented: (i) the independent-particle approximation considering both interband and intraband contributions for metals and (ii) the Bethe-Salpeter equation for insulators. Since, notably, the optimal basis set is systematically improvable, accurate results can be obtained at a strongly reduced computational cost. Moreover, ","authors_text":"Gianluca Prandini, Mario Galante, Nicola Marzari, Paolo Umari","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2018-12-21T16:26:36Z","title":"SIMPLE code: optical properties with optimal basis functions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.03175","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:1a3990921963ae1f7f38b10c021db2ca28cc47c73ec31eba914791f48e0848be","target":"record","created_at":"2026-05-17T23:43:16Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"144d91c76c53d8aaafa92c5160d54af145cd8d12f7e064d1f81266ba4e353777","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2018-12-21T16:26:36Z","title_canon_sha256":"ed71590c83c9386acd0f1ac2c30db087458f503966112d680aff4ca550ba8edd"},"schema_version":"1.0","source":{"id":"1901.03175","kind":"arxiv","version":2}},"canonical_sha256":"49551b45bb407cd611172cc9f343fb821f4d5cc30b8c7503bdbd33eeaf667f0a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"49551b45bb407cd611172cc9f343fb821f4d5cc30b8c7503bdbd33eeaf667f0a","first_computed_at":"2026-05-17T23:43:16.945140Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:43:16.945140Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HQKUpkh2m8aBdoAHaV9gFKNbklU+hB/Zgs5aySM1NBGHKVQmjwBToeHr8LTaOLTBudQB2ttgWegXLVJk/+uFDQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:43:16.945800Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.03175","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1a3990921963ae1f7f38b10c021db2ca28cc47c73ec31eba914791f48e0848be","sha256:ae63ae7143dfa3acc9bf5c3ac38fac68eede0d07e2657a5575cc1a59daf433fd"],"state_sha256":"14b857d22c2f8b61c1662977abfee7fc27e1e0fc9d78cb624fce859f24862834"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"seVY46IB+6s7Hv6vFtCfnfQJ7fV5f+kkwX4xsjqqlZU9rPI4M5Mzh57QibEKXoaVRT93wCvxNX5y4dBuoMcuBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T22:45:11.875740Z","bundle_sha256":"58149dd71e11603a6a314702b69d71bfe1b6674bc4ed2aac2484450cf63c65db"}}